30m望远镜宽视场光谱仪支撑结构选型研究  

Structural form selection of supporting structures for WFOS of TMT

作　　者：郑凌宇 张大旭[1] AMAN·Shrestha 宋振森[1] 高圣彬[1] 徐腾[2] 许明明[2] ZHENG Ling-yu;ZHANG Da-xu;AMAN·Shrestha;SONG Zhen-sen;GAO Sheng-bin;XU Teng;XU Ming-ming(School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;National Astronomical Observatories/Nanjing Institute of Astronomical Optics&Technology,CAS,Nanjing 210042,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]中国科学院国家天文台南京天文光学技术研究所,江苏南京210042

出　　处：《机电工程》2020年第9期1020-1025,1038,共7页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金资助项目(U1831105,11272207,11603054);江苏省自然科学基金资助项目(BK20191507)。

摘　　要：针对30 m望远镜宽视场光谱承载能力与轻量化程度低的问题,对于已有的桁架支撑结构方案,提出了宽视场光谱仪板壳支撑结构方案。建立了两者的有限元模型,分别从质量、变形、应力与基频等方面对铟钢桁架和铟钢板壳结构性能进行了评价,利用等刚度理论确定了碳纤维复合材料板壳结构的构件厚度,并与铟钢板壳结构的性能进行了对比。研究结果表明:碳纤维复合材料板壳支撑主结构质量为1.93 t,最大相对位移为0.286 mm,最大应力为30.94 MPa,基频为7.98 Hz,均满足设计要求,是宽视场光谱仪支撑结构的理想形式,对大口径望远镜光学仪器支撑结构选型与设计具有指导意义。Aiming at the problem of the low bearing capacity and lightweight rate of WFOS of TMT,a shell supporting structure scheme was proposed for the existing truss supporting structure scheme.The finite element models for two type of structures were developed.The performance of truss structure and shell structure,both composed of invar,were evaluated from the aspects of mass,displacement,stress and fundamental frequency.By the principal of equivalent stiffness,the thickness of carbon fiber composite shell components were determined.The results indicate that under the action of gravity in the most unfavorable direction of rotation,the mass of the composite structure is 1.93 t with a fundamental frequency of 7.98 Hz.The maximum relative displacement between each optical element is 0.286 mm,and the maximum stress is 30.94 MPa.Hence,the composite shell structure meets the design requirements which makes it an ideal supporting structural form.The results of this study can guide the selection and design of the supporting structure for optical instruments of extremely large telescopes.

关 键 词：30 m望远镜 宽视场光谱仪 结构选型 有限元分析 

分 类 号：TH751[机械工程—仪器科学与技术] TH703[机械工程—精密仪器及机械]